HMH Cut To Length Plastic Tubing is easy to work with as well as inexpensive. The plastic tubing can be cut to any length allowing you to customize the flies to your liking. The junction tubing included with the rigid tubes is the proper size to fit the rigid tubes it comes with. The Large Rigid Tubing measures 1/8 inch OD x 5 inches long. Each package contains 12 pieces of the rigid tubing and approximately 12 inches of junction tubing. The Micro Tubing measures 1/16 inch OD x approximately 36 inches long. Micro tubing is great for use when tying smaller flies such as nymphs or dries. This tubing makes excellent liner material when tying with metal tubes, acting as a protector for your leader material. The micro tubing fits nicely into a standard 3/16 inch bead head. The micro tubing is also great for nesting. The Small Rigid Tubing measures 3/32 inch OD x 5 inches long. Each package contains 12 pieces of the rigid tubing and approximately 12 inches of junction tubing.